Ventilating-screen.



PAENI VENTILATING-SCREEN.

Specification of Letters Patent.

Patented July 25, 1911.

Application filed Getober 1A, 1910. Serial No. 587,011.

To all whom it may concern:

Be it known that I, Lewis A. KAnLsoN, a citizen of the United States,residing at Minneapolis, in the county of I-Iennepin and State ofMinnesota, have invented certain new and useful Improvements inVentilating-Screens; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention has for its particular object to provide an improvedventilating screen which is adjustable so that it may be interlockedwith a window frame and removed therefrom.

To the above ends, the invention consists of the novel devices andcombinations of devices hereinafter described and defined in the claims.

In the accompanying drawings, which illustrate the invention, likecharacters inclicate like parts throughout the several views.

Referring to the drawings, Figure 1 is a view in elevation, looking atthe inner side of a window frame and showing my improved ventilatingscreen applied in working position, some parts being broken away; Fig. 2is a fragmentary view in elevation showing a portion of the screen; andFig. 3 is a detail in section on the line 00 m of Fig. 1.

The window frame 1, which is of the usual construction, is provided withthe customary outside stop strips 2 and co6p crating stop strips notshown, which, as is well known, form a vertical guide channel for themovable sash 3.

The improved frame is rectangular in form and is made up of two rigidframe sections 4 and 5, the upper and lower bars of which, at thetransverse center of the device, are formed with overlapping joints 6having cooperating stop surfaces 7 for limiting the downward movementsof the frame section 5 in respect to the frame section 4. The openingsin the frame made up of the sections 4: and 5 are covered by flexiblescreening material such, for instance, as cheese cloth or similar porousfabric, which will be flexible enough at the joints between the framesections to permit the necessary vertical movements of the frame section5 in respect to the frame section l. The two frame sections 1 and 5,

close to their joints, are pivotally connected to lovers 8 which arepreferably limited on the inner surfaces of the'said frame. The levers 8and overlapping joints 6 hold the frame sections in lateral alinement.By upward pivotal movement of the lower lever S and downward pivotalmovement of the upper lever S, the frame section 5 will be raised andthen moved toward the frame section 4., so as to shorten the length ofthe frame and thereby permit the same to be applied in the channel ofthe window frame below the sash 3 or to be removed therefrom. When thelevers S are thrown into horizontal positions, the frame is extended andinterlocked with the window frame.

This device was especially designed for use in bedrooms and elsewherewhere good ventilation is desired without permitting drafts, but it iscapable of general use as'a portable window screen. The device is ofsmall cost and is efficient for the purposes had in view.

What I claim is:

1. In a screen of the kind described, comprising a rectangular framehaving two of its parallel bars severed, means connecting the severedend portions of said bars for movements into and out of longitudinalalinement for extending and shortening said frame, and a flexiblescreening material covering the opening in said frame and spanning thesevered end portions of said bars, substantially as described.

2. A screen of the kind described having a frame made up of rigidsections jointed together, the openings thereof being covered withflexible screening material, and a pair of levers pivotally connected tothe frame sections in the vicinity of their joints, the said leversserving to extend and shorten the said frame, substantially asdescribed.

8. A screen of the kind described having rigid frame sections withoverlapping joints and cooperating stop surfaces, and levers pivotallyconnected to the said frame sec- In testimony whereof I aflix mysignature tions in the vicinity of their overlapping in presence of twoWitnesses. 'oints the said levers servin t0 len 'then find shorten thesaid frame, mil cooper ating LEWIS KARLSON' with the overlapping jointsthereof to hold Witnesses:

v the frame sections in transverse alinernent, STEPHEN MAHONEY,substantially as described. ALICE V. SWANsoN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. G.

